The brightest stars in nearby galaxies. VI - Cepheids and the brightest stars in WLM

Abstract

view Abstract Citations (79) References (35) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The brightest stars in nearby galaxies. VI. Cepheids and the brightest stars in WLM. Sandage, A. ; Carlson, G. Abstract The brightest red and blue supergiants in the nearby, highly resolved Im IV-V galaxy WLM have been identified and photometered relative to a photoelectric sequence measured to V = 18.6, B = 19.5. The sequence is extended to V = 22, B = 23. The mean magnitudes for the three brightest blue and red supergiants are <B(3)> = 17.74 (or 17.69 depending on membership) for the blue stars, and <V(3)> = 17.88 for the red stars. Periods and light curves have been determined for 15 Cepheids. All periods are less than 10 days. A special effort was made to find longer-period Cepheids but without success. The color-magnitude diagram of WLM shows progenitor main-sequence stars to exist brighter than the luminosity interval that is necessary to produce such longer-period Cepheids. The absence of such variables is discussed. The distance modulus from the Cepheid P-L relation is (m-M)AB = 24.93. The bright-star calibrations are consistent with, and add to, the existing M(star) = f[M(galaxy)] correlations obtained from other nearby galaxies with Cepheid distances. Publication: The Astronomical Journal Pub Date: August 1985 DOI: 10.1086/113856 Bibcode: 1985AJ.....90.1464S Keywords: Cepheid Variables; Color-Magnitude Diagram; Dwarf Galaxies; Reference Stars; Stellar Magnitude; Stellar Spectrophotometry; Supergiant Stars; Blue Stars; Calibrating; Electrophotometry; Light Curve; Red Giant Stars; Stellar Evolution; Astronomy full text sources ADS | data products SIMBAD (73) NED (52) GCPD (1) Related Materials (8) Part 1: 1976AJ.....81..743S Part 2: 1983AJ.....88.1569S Part 3: 1984AJ.....89..621S Part 4: 1984AJ.....89..630S Part 5: 1985AJ.....90.1019S Part 7: 1986AJ.....91..496S Part 8: 1988AJ.....96.1599S Part 9: 1996AJ....111.1872S